package com.gooagoo.supercrm.app;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

public class CrashHandler implements Thread.UncaughtExceptionHandler
{

	private Logger log = Logger.getLogger(CrashHandler.class);
	public static final String TAG = "CrashHandler";

	// 系统默认的UncaughtException处理类
	private Thread.UncaughtExceptionHandler mDefaultHandler;
	// CrashHandler实例
	private static CrashHandler INSTANCE = new CrashHandler();
	// 程序的Context对象
	private Context mContext;
	// 用来存储设备信息和异常信息
	private Map<String, String> infos = new HashMap<String, String>();

	/** 保证只有一个CrashHandler实例 */
	private CrashHandler()
	{
	}

	/** 获取CrashHandler实例 ,单例模式 */
	public static CrashHandler getInstance()
	{
		return INSTANCE;
	}

	/**
	 * 初始化
	 * 
	 * @param context
	 */
	public void init(Context context)
	{
		mContext = context;
		// 获取系统默认的UncaughtException处理器
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		// 设置该CrashHandler为程序的默认处理器
		Thread.setDefaultUncaughtExceptionHandler(this);
	}

	/**
	 * 当UncaughtException发生时会转入该函数来处理
	 */
	@Override
	public void uncaughtException(Thread thread, Throwable ex)
	{
		if (!handleException(ex) && mDefaultHandler != null)
		{
			// 如果用户没有处理则让系统默认的异常处理器来处理
			mDefaultHandler.uncaughtException(thread, ex);
		} else
		{
			try
			{
				Thread.sleep(3000);
			} catch (InterruptedException e)
			{
				Log.e(TAG, "error : ", e);
			}
			Class<?> forName;
			try {
				//TODO
				forName = Class.forName("com.gooagoo.supercrm.ui.activity.login.LoginActivity");
				Intent intent = new Intent(mContext, forName);
	            //重启应用，得使用PendingIntent
	            PendingIntent restartIntent = PendingIntent.getService(
	                    mContext, 0, intent,
	                    PendingIntent.FLAG_CANCEL_CURRENT);
	            //退出程序
	            AlarmManager mAlarmManager = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
	            mAlarmManager.set(AlarmManager.RTC, System.currentTimeMillis() + 1000,
	                    restartIntent); // 1秒钟后重启应用
				ActivityStackManager.getInstance().finishAllActivity();
			// 退出程序
			android.os.Process.killProcess(android.os.Process.myPid());
			System.exit(1);
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
	 * 
	 * @param ex
	 * @return true:如果处理了该异常信息;否则返回false.
	 */
	private boolean handleException(Throwable ex)
	{
		if (ex == null)
		{
			return false;
		}
		// 使用Toast来显示异常信息
		new Thread()
		{
			@Override
			public void run()
			{
				Looper.prepare();
				Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();
				Looper.loop();
			}
		}.start();

		// 收集设备参数信息
		collectDeviceInfo(mContext);
		// 保存日志文件
		Logger.getLogger(CrashHandler.class).error(TAG, ex);
		return true;
	}

	/**
	 * 收集设备参数信息
	 * 
	 * @param ctx
	 */
	public void collectDeviceInfo(Context ctx)
	{
		try
		{
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
			if (pi != null)
			{
				String versionName = pi.versionName == null ? "null" : pi.versionName;
				String versionCode = pi.versionCode + "";
				// packagename = pi.packageName;
				infos.put("versionName", versionName);
				infos.put("versionCode", versionCode);
			}
		} catch (NameNotFoundException e)
		{
			Log.e(TAG, "an error occured when collect package info", e);
		}
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields)
		{
			try
			{
				field.setAccessible(true);
				infos.put(field.getName(), field.get(null).toString());
				log.info("CrashHandler"+field.getName() + " : " + field.get(null));
			} catch (Exception e)
			{
				log.error("an error occured when collect crash info", e);
			}
		}
	}

	/**
	 * 保存错误信息到文件中
	 * 
	 * @param ex
	 * @return 返回文件名称,便于将文件传送到服务器
	 */
	private String saveCrashInfo2File(Throwable ex)
	{

		StringBuffer sb = new StringBuffer();
		for (Map.Entry<String, String> entry : infos.entrySet())
		{
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}

		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null)
		{
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		String result = writer.toString();
		sb.append(result);
		try
		{
			long timestamp = System.currentTimeMillis();
			String fileName = timestamp + "apklog.zip";
			if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
			{
				File dir = new File("/sdcard/crmlogs");
				if(!dir.exists()){
					dir.mkdirs();
				}
				File file = new File(dir, fileName);
				FileOutputStream fos = new FileOutputStream(file);
				fos.write(sb.toString().getBytes());
				fos.close();
			}
			return fileName;
		} catch (Exception e)
		{
			Log.e(TAG, "an error occured while writing file...", e);
		}
		return null;
	}

}